Ap Chemistry
Hydrogen gives off 120. J/g of energy when burned in oxgyen, and methane gives off 50. J/g under the same circumstances. If the mixture of 5.0 g of hydrogen and 10. g of methane is burned, and the heat released is transferred to 50.0 g of water at 25.0 degress Celsius, what ...October 17, 2009

physics
Is it possible for a car to move in a circular path in such a way that it has a tangential acceleration but no centripetal acceleration?October 9, 2009

algebra (excel)
I am trying to create a forumla that will subtract two columns and in the third column tell me if the one column is greater than the other column by 10%. So far I have IF(AND(A:A-B:B>(10%)*(A:A)=TRUE),C2,"FALSE") which is giving me false for everything but I know ...September 16, 2009

math
18 inches is the answer to the first question because you must be 48 but you are only 30 now, you must grow 18 (48-30) 1,010 is the answer to the second question, 840+1,150=1990 but you can only eat 3,000-1,990 now which is 1,010 :)March 14, 2009

psychology
1. The experimental rats were being raised in separate environments. One group lived in the traditional cage in a quiet, but well lighted room. They were supplied with plenty of food and water. The second group inhabited "Rat Disney Land." There were colorful ...March 13, 2009

sci/275
Review Ch. 5, The Flow of Energy Through Ecosystems. Then, complete Appendix C. · Post your response to the following: Identify the fruit or vegetable you selected and relate the second law of thermodynamics to the changes in energy observed in Appendix C. How did the ...December 9, 2008

Algebra check
Where appropriate, include the approximation to the nearest ten-thousandth. 27.) log x = -3 I have the answer as 1 28.) 7 ^(4-9x)= 49 I have the answer as 2/9 29.) 8^x =5.2 not sure 30.) 1n x=5/8 not sure Are these answers right?December 1, 2008

Algebra help 2
Where appropriate, include the approximation to the nearest ten-thousandth. 27.) log x = -3 I have the answer as -3 28.) 7 ^(4-9x)= 49 I have the answer as 2 29.) 8^x =5.2 not sure 30.) 1n x=5/8 not sure Are these answers right?December 1, 2008

Algebra check DrBob222
I have a question the formula that I used was b^y=x means that logbx=y is this the correct formula? so using that formula I got the following. 4^-3 =1/64 I have the answer as log4 1/64 =-3 144^1/2 =12 I have the answer as log 144^12 =1/2November 30, 2008

Algebra check
Convert to Logarithmic equations. 10. 4^-3 =1/64 I have the answer as log4 1/64 =-3 11. 144^1/2 =12 I have the answer as log 144^12 =1/2 Are these answers right?November 30, 2008

Algebra inverse question
Hi Reiny, I just have one question for 4.) the problem is g(x)= (x+5)^3 how were you able to convert the equation to the following? let y = (x+5)^2 interchange x with y x = (y+5)^2November 30, 2008

Algebra inverse
Find the formula for the inverse of each funtion. 3.) f(x)= 2x-5 for this one I have y= (x+5)/2 is this correct? 4.) g(x)= (x+5)^3 I am stuck on this one.November 30, 2008

Algebra help
Find (fog)(x)and (gof)(x)if f(x)=x-x^2 and g(x)= 2x+3. Okay so I did the following: For f(of)g(x), take (2x+3) - (2x+3)^2 (insert g(x) where the "x" is in f(x) ) For g(of)f(x), take 2[x-x^2] +3 The first answer that I get for (2x+3) - (2x+3)^2 is -4x^2-12x-9 The ...November 30, 2008

Algebra word problem help
The average walking speed R of people living in a city of population P,in thousands, is given by R=0.37InP+0.05, where R is in feet per second. a.) The population of Honolulu, Hawaii is 395,790. Find the average walking speed. b.) A city's average walking speed is 2.70 ft/...November 21, 2008

6th geography
Yeah i have 2 more that i cant find: can you answer (or atleast help with) these questions- Number the rivers in the sequence the NY giants will cross them en route to the valley of the sun(Tennessee) And (the other question is much more important)what 5 states cover the area ...November 20, 2008

Math Algebra check
Which of the following quadratic equations has -4 and 3/4 as the solutions? a.)x^2+(13/4x)-3 b.)x^2+(30/7x)-(25/7) c.)x^2+(30/7x)+(25/7) d.)x^2-(13/4x)+3 I substituted the values and I have the answer as (a.)November 9, 2008

Math help
Which of the following quadratic equations has -4 and 3/4 as the solutions? a.)x^2+(13/4x)-3 b.)x^2+(30/7x)-(25/7) c.)x^2+(30/7x)+(25/7) d.)x^2-(13/4x)+3 I substituted the values and I have the answer as (a.)November 9, 2008

Math help
Solve: x^2 +5x=1. Use a calculator to approxiamte the solutions with rational numbers. is the answer -0.1925824, 5.65331193 ?November 9, 2008

Math check
Complete the square: x^2 -12x. Which of the following is the correct perfect-square trinomial? the answers are: a.) x^2 +22x+121 b.) x^2 -10x+25 c.) x^2 -20x+44 d.) x^2 -12x+36 This is tough because the answers could be a.) b.) and d.) I am not sure which to choose.November 9, 2008

word problem 3
Rosie's Palm Pirates, a manufacturer of electronic organizers, estimates that when x hundred Palm Pirates are made, the average cost per unit is given by C(x) = 0.4x^2 -3.68x+9.524, where C is in hundreds of dollars. What is the minimum cost per unit? is the answer $ 10.60November 9, 2008

Math help
What is the y-intercept of f(x)=x^2+x-12? the answers are a.)(0,12) b.)(-72,0) c.)(0,-12) d.)(0,-72) I have the answer as (c.)(0,-12) is this right?November 9, 2008

Algebra y-intercept
What is the y-intercept of f(x)=x^2+x-12? the answers are a.)(0,12) b.)(-72,0) c.)(0,-12) d.)(0,-72) I have the answer as (c.)(0,-12) is this right?November 9, 2008

Math word problem 2
Sabine and Hercule can assemble a table in 45 minutes. Working alone, it takes Hercule 48 minutes longer than Sabine to put this table together. How long would it take for Sabine to assemble the table by herself? What formula would I use to solve this?November 9, 2008